1020861965 has 4 divisors (see below), whose sum is σ = 1225034364. Its totient is φ = 816689568.

The previous prime is 1020861851. The next prime is 1020861967. The reversal of 1020861965 is 5691680201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 443228809 + 577633156 = 21053^2 + 24034^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020861965 - 2¹⁰ = 1020860941 is a prime.

It is a super-2 number, since 2×1020861965² = 2084318303167322450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020861967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102086192 + ... + 102086201.

It is an arithmetic number, because the mean of its divisors is an integer number (306258591).

Almost surely, 2^1020861965 is an apocalyptic number.

It is an amenable number.

1020861965 is a deficient number, since it is larger than the sum of its proper divisors (204172399).

1020861965 is an equidigital number, since it uses as much as digits as its factorization.

1020861965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204172398.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1020861965 is about 31950.9305811271. The cubic root of 1020861965 is about 1006.9061831697.

The spelling of 1020861965 in words is "one billion, twenty million, eight hundred sixty-one thousand, nine hundred sixty-five".